What are the ramifications of changing a users login name? Manager got married, I have changed her account name, display name, fwd her email etc and now she wants her login name changed to reflect the new last name. If I make the change, what am I looking at here? Any bad juju??

These days you probably don't even need to redirect emails. I don't know what you've got in place, but there should be no reason why you can create the old name as an alias of the mailbox, so mailflow continues unaffected.